Saturday hack sessions are currently hosted by the very nice City of Charles Sturt.
Located at The Brocas
111 Woodville Road
Enter from Brocas Avenue.
Sessions are every Saturday 1pm-4pm.
This is the main hack area, with tables on wheels, whiteboards & wifi.
The grounds are beautiful, and have room enough to fly (for example) quad-copters.
There's loads of parking across the tennis courts, and in Brocas Avenue.
This map shows more clearly where the Hacksession is actually held.
Slightly higher resolution map showing where the Hacksession is held.
The Brocas is close to the Woodville train station, on the Outer Harbour line.
A slightly Evil-Dead-esque animation showing how to get to the hacksession from the street entrance to The Brocas.
The network at Woodville can be a little tricky so it has its own page